Operation CHARM: Car repair manuals for everyone.
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Visual Inspection

Visual Inspection
This inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis. Inspect the vehicle for non-Ford factory add-on devices such as:
- Electronic add-on items:
- air conditioning.
- generator (alternator).
- engine turbo.
- cellular telephone.
- cruise control.
- CB radio.
- linear amplifiers.
- backup alarm signal.
- computer.
- Vehicle modification:
- These items, if not installed correctly, will affect the powertrain control module (PCM), or transaxle function. Pay particular attention to add-on wiring splices in the PCM harness or transaxle wiring harness, abnormal tire size, or axle ratio modifications.
- Leaks.
- Correct linkage adjustments.